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A pneumatic fastener driving tool includes a return system for efficiently and rapidly returning a drive piston to the static position and effecting a fastener feeding operation. A housing defines a pressure fluid reservoir connected by a pneumatic control system to a first side of a drive piston to

A pneumatic fastener driving tool includes a return system for efficiently and rapidly returning a drive piston to the static position and effecting a fastener feeding operation. A housing defines a pressure fluid reservoir connected by a pneumatic control system to a first side of a drive piston to move a driver blade through a drive track in a drive stroke. A pressure fluid actuated fastener feed assembly advances fasteners along a feed path to the drive track. Following a drive stroke, the return system connects the reservoir to the second side of the drive piston for moving the drive piston and driver blade in a return stroke. The return system also connects the reservoir to the fastener feeding assembly for feeding of a fastener. The return system includes two separate return valves operable at different flow capacities and fluid pressures for drive piston return and for fastener feeding.

대표청구항 ▼

A fastener driving tool comprising a pressure fluid reservoir, a drive piston, a fastener feed piston, valve means to connect the reservoir to the drive piston to effect a fastener drive stroke, and a pressure fluid return system for returning the drive piston and operating the feed piston at the en

A fastener driving tool comprising a pressure fluid reservoir, a drive piston, a fastener feed piston, valve means to connect the reservoir to the drive piston to effect a fastener drive stroke, and a pressure fluid return system for returning the drive piston and operating the feed piston at the end of a drive stroke, said return system comprising in combination: a drive piston return valve having an inlet connected to the reservoir and an outlet connected to the drive piston; and a feed piston return valve having an inlet connected to the reservoir and an outlet connected to the fastener feed piston. A fastener driving tool including a housing defining a reservoir for pressurized fluid, a cylinder, a drive piston movable in said cylinder, a driver carried by the drive piston and movable along a drive path, fastener feeding means for advancing a fastener into the drive path, valve means for connecting a first side of said drive piston to the reservoir for moving the drive piston and driver in a drive stroke, and the improvement comprising a first return valve for connecting said reservoir to the second side of said drive piston for moving the drive piston and driver in a return stroke to a static position and a second return valve for connecting the reservoir to said fastener feeding means.